Customisability & administration
Mould them to your liking.
When it comes to tweaking the installation, Debian, Fedora and Ubuntu rely on tools from the Gnome desktop, primarily the Gnome Settings for configuring installation. Besides this, the distros offer a different set of tools. For instance, Debian ships with Extensions Manager and Gnome Tweaks Tool, while Fedora has the Connections remote desktop client. Ubuntu has tweaked the Software & Updates app to let you easily enable additional repos and manage proprietary drivers.